The invention concerns a hair treatment apparatus, comprising: —two arms that are movable relative to each other and capable of assuming a spaced-apart configuration in which a lock of hair can be inserted between them, and a closed configuration for treating the lock of hair, the arms being capable of being moved along the lock in this closed configuration, —two contact surfaces carried respectively by the two arms, arranged opposite each other, at least one of the contact surfaces being heated, —at least one steam outlet carried by one of the arms at a distance from the corresponding contact surface, in order to expose the hair engaged between the arms to steam, —a containment structure for at least partially containing the steam, carried at least partially by the other of said arms, —a comb having teeth, carried by said one of the arms that carries said at least one steam outlet, said at least one steam outlet being interposed between the comb and the contact surfaces.